testing and small fixes

added guides in elements
uncommented build/all.js (guides)
fixed build url in elements index.jade
fix 1 to footer navigation
New Developers page

page is still a mock
fix 2 - footer navigation

changed to target="_blank" on external links
updated urls
Fixed guides CSS
Adding dropdown on documentation step1
dropdown menu for documentation on header menu
Whitespace fixes
Merge branch 'sergio' closes #34 thanks @SergioCrisostomo and @andrefbarata